DB2 LUW 表在读取时被锁定

Question

I have a range partitioned table in my database, it is range partitioned by a date column: transaction_date, with 1 partition per 1 month.

Now my problem is: When running SQL statement to read data from the table,

select col1,col2 from mytable where ID=1

My table is very large so it takes a long time for the SQL to finish. However, there is another ETL job to insert (append) data to the table at the same time, the insert operation cannot start until the read SQL finishes.

Any suggestions I can avoid this issue while reading data? Also are there any IBM official documents regarding this problem?

** EDIT 1:

$ db2level
DB21085I  This instance or install (instance name, where applicable:
"db2inst1") uses "64" bits and Db2 code release "SQL11011" with level
identifier "0202010F".

Informational tokens are "DB2 v11.1.1.1", "s1610100100", 
"DYN1610100100AMD64", and Fix Pack "1".

Product is installed at "/opt/ibm/db2/v11.1". 

$ db2set -all
[i] DB2COMM=TCPIP
[i] DB2AUTOSTART=TRUE
[i] DB2OPTIONS=+c
[g] DB2FCMCOMM=TCPIP4
[g] DB2SYSTEM=<server hostname>
[g] DB2INSTDEF=db2inst1

** EDIT 2:

For the select and load SQL statement, I am not specifying any isolation level.

For the ETL job, it is an IBM DataStage job, the ETL insert is a bulk load append operation to insert data to a pre-existing range.

Answer 1

You may use the MON_LOCKWAITS administrative view to check what's happening during such a lock situation. You may optionally format a lock with the MON_FORMAT_LOCK_NAME function to get more details on this as well.

SELECT 
  W.*
--, F.NAME, F.VALUE
FROM SYSIBMADM.MON_LOCKWAITS W
--, TABLE(MON_FORMAT_LOCK_NAME(W.LOCK_NAME)) F
--WHERE W.REQ_APPLICATION_HANDLE = XXX -- if you know the holder's handle to reduce the amount of data returned
ORDER BY W.LOCK_NAME
;